I struggle to believe there were zero of them in America before Columbus. Maybe god did a miracle but idk
If there were any, then God could certainly have worked a miracle. As St. Thomas Aquinas says, God is capable of giving them an internal inspiration of the faith ... or to send a missionary. If there weren't any, then there's a reason God allowed those souls to be born in that time or place.
Did you hear of how Mary of Agreda was bilocated to America to help convert some of the Indians?
https://www.traditioninaction.org/History/B_014_Agreda_2.htmlWhat exactly would have stopped God from miraculously transporting a priest or some other Christian in pre-Columbian times to North America to convert and baptize such a soul? Answer: absolutely nothing.
It is said that Leif Eriksson converted Greenland to Catholicism, around the year 1000, and the population requested a bishop, and that the Norse also had settlements in North America (Canada). Despite popular belief, Columbus did not discover America, but the Norse did. Eric the Red, Leif's father, lived in a Norse colony in Iceland, but he was banished for killing someone. He then set out and found Greenland. He named it that to make it more "attractive" to potential new settlers. His son Leif converted to Catholic Christianity. He converted his mother, but his father Erik did not convert. In any case, Leif then traveled to Greenland to convert the population, and they subsequently requested a bishop. They ventured farther into Newfoundland as well, and it's probable that they took Christianity there also .. .as certain Christian artifacts have been discovered at the Norse Newfoundland sites.